Piston-valve.



Patented Nov. I4, 189 9.

D D 0 F M u M A Gm PISTON VALVE.

'Applicxtixm filed Mar. 20, 1899.)

No Model.

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UNITED STATES PATENT OFFICE.

GEORGE A. MUMFORD, OF ROCHESTER, NEW YORK.

PISTON-VALVE.

SPECIFICATION forming part of Letters Patent No. 637,010, dated November14, 1899.

Application filed March 20, 1899- Serial No. 709,767. (No model) To allwhom it may concern:

Be it known that I, GEORGEA. MUMFORD, a citizen of the United States,residing at Rochester, Monroe county, New York, have invented certainImprovements in Piston- Valves, of which the followingis aspecification, reference being had to the accompanying drawings.

My invention relates to certain improvements in piston-valves designedas a substitute for the usual three-way valve for any purpose for whichthe same may be used.

One of the principal features of my invention is to provide forrepacking the pistonvalve from the outside of the casing withoutdisturbing the connecting-piping.

My improvements are fully described and illustrated in the followingspecification and the accompanying drawings, the novel features thereofbeing specified in the claims annexed to the said specification.

In the accompanying drawings, representing my improved piston-valve,Figure 1 is a side elevation. Fig. 2 is an end View. Fig. 3 is a centrallongitudinal section. Fig. 4 is a transverse section on the line 4 4,Fig. 3, showing the parts to the left of such line. Fig. 5 is a planview, the cover being removed. Fig. 6 represents the piston-valve, thetoothed segment and rack detached. Fig. 7 repre sents a modification ofthe follower.

7 My improved valve consists, essentially, of a suitable casing A,provided with a removable cover B, the sliding piston-valves G 0,connected together by the rack-bar D, and the toothed segment E, bywhich the valves are shifted to open or close the same. My improvedvalve is capable of being used for water, steam, air, gas, or otherfluids or liquids under pressure.

F represents the inlet, which may be made in either side of the bottomand to which any suitable supply-pipe is connected.

G G are the outlets, to either of which the flow of the fluid or liquidis directed, according to the position of the valve. When the valveoccupies the position indicated by the full lines in Figs. 3 and 6,there is no current through it; but whenit is shifted to the right orleft, as indicated by the dotted lines,

the discharge will be directed to the corresponding outlet.

' the opening in the case.

The cover B is secured to the body of the case A by screws or othersuitable devices, the packing H being interposed, if desired, andsuitable flanges I being formed around The cover Bis provided with asuitable hood J, in which the toothed segment swings.

K is a rock-shaft to which the toothed segment is attached. Therock-shaft projects outward through one side of the hood and is providedwith a hand-lever L, by which the position of the valve is shifted. Therockshaft is provided with a suitable stuffing-box M and, if it is madeto extend through the hood, with a suitable gland N on the other end.The shaft in the construction shown is squared and fits a correspondinghole in the .toothed segment. a

O is a removable cleaning-plug threaded into the bottom of the casing.This plug serves to permit the discharge from the easing, or from any ofthe connecting-piping or any boiler or reservoir connected therewith, ofany accumulation of sediment or other refuse matter.

The rack-bar is provided at either end with circular bosses P P, whichare threaded into the pieces of piping forming the piston-valves O C, sothat the rack bar may be detached from either of the valves or either ofthem maybe detached from the bar. The threads on the two bosses may beright or left hand. The valves 0 C are provided with the ports ororifices Q Q, which in their aggregate area are preferably made equal tothe area of the discharge-pipes. The outlets G and G are threaded intothe ends of the casing, being constructed so that they are screwed infrom the inside outward, the outlets being provided with the collars RR, which abut against the interior of the ends of the case. The collarsR R are provided with a recess to receive the packing S and followers TT.

V V are adjusting-screws for tightening the packing, which is doneentirely from the outside without in any way interfering with the use oroperation of the valve or in any way disturbing any of theconnecting-piping.

The followers T T are provided with ears or lugs U U, which are threadedto receive the screws V V. On the right-hand end of Fig. 3 the plane ofsection is taken through the screw V 011 the line m :0, Fig. t. Outsidethe ends of the ease the adjusting-screws V V are provided with theheads X, adapted to be turned by a wrench, and the packing Y is insertedunder these heads.

The operation of my improved valve will have been already understoodfrom the preceding description. The valve being connected up byoperating the lever L, the current through it may be entirely out off orit may be directed in either direction.

Any suitable kind of packing may be used around the valves at S.

My improved valve is cheap and simple in construction, very convenientand durable in operation, and the packing can be made tight on either orboth of the valves by turning the adjusting-screws V V, which maybe donefrom the outside without in anyway disturbing the connections orstopping the ordinary uses of'the valve. It will also be understood thatmy improved valve may be built with a discharge-outlet in one directiononly. It will also be understood that the follower, as indicated in Fig.7, may be threaded into its gland, in which case the packing may betightened on removing the cover, the outlets remaining closed. A screwor screws I may be employed to prevent the unscrewing of the outlet Gwhen a coupling or union is screwed onto it.

V W represent plates attached to the rackbar to keep the rack andsegment in the proper engagement with each other.

I claim-- 1. The combination, with the casing provided with theremovable cover and the inlet, of the discharge-pipe, the piston-valvesliding therein and provided with a suitable discharge-port, the glandand packing surrounding the valve, the follower, and theadjusting-screws adapted to adjust the follower to tighten the packingfrom the outside of the case, as and for the purposes set forth.

2. The combination, with the casing provided with the removable coverand the inlet, of the two oppositely-located dischargepipes, thepiston-valves sliding therein and connected together by the bar, thedischargeports in the valves, theglands and packings surrounding thevalves, and means for adjusting the followers outward, as and for thepurposes set forth.

3. The combination, with the casing provided with the removable coverand the inlet, of the two oppositely-located dischargepipes, thepiston-valves sliding therein and connected together by the bar, thedischargeports in the valves, the glands and packings surrounding thevalves, and means for adjusting the followers outward, and mechanism forshifting the valves simultaneously, as and for the purposes set forth.

4. The combination, with the casing, the removable cover, and suitableconnecting-piping, of the discharge-pipe inserted through the casingfrom the interior and having the inside collar, the recess for packingin the collar, the follower, the sliding valve provided with a suitableport, the adjusting-screws arranged to adjust the follower from theoutside of the casing, and means for shifting the valve, as and for thepurposes set forth.

5. The combination with the casing provided with the inlet, theremovable cover and the plug in its bottom, of the outlet-pipes atopposite ends of the casing, the valves sliding therein, the barconnecting the valves,

the glands and packing surrounding the valves, and means for tighteningthe packing on either valve from the outside of the case, withoutdisturbing the connecting-piping or the cover, as and for the purposesset forth.

GEORGE A. MUMFORD.

Witnesses:

GEO. B. SELDEN, O. G. GRANNELL.

